Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Chapter 27, Problem 27.25QAP
Interpretation Introduction
Interpretation:
Percentages of each component should be calculated.
Concept introduction:
Area normalization method is used in quantitative analysis of compounds in chromatography. In this method of quantification, complete elution of all analytes in the sample is required. Following formulas are required for the calculation.
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Please help me with # 4 and 5. Thanks in advance!
A small artisanal cheesemaker is testing the acidity of their milk
before it coagulates. During fermentation, bacteria produce lactic
acid (K₁ = 1.4 x 104), a weak acid that helps to curdle the milk and
develop flavor. The cheesemaker has measured that the developing
mixture contains lactic acid at an initial concentration of 0.025 M.
Your task is to calculate the pH of this mixture and determine whether
it meets the required acidity for proper cheese development. To
achieve the best flavor, texture and reduce/control microbial growth,
the pH range needs to be between pH 4.6 and 5.0.
Assumptions:
Lactic acid is a monoprotic acid
H
H
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H-C-C
H
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O-H
Figure 1: Lewis Structure for Lactic Acid
For simplicity, you can use the generic formula HA to represent the acid
You can assume lactic acid dissociation is in water as milk is mostly water.
Temperature is 25°C
1. Write the K, expression for the dissociation of lactic acid in the space provided. Do not forget to
include state symbols.…
Curved arrows are used to illustrate the flow of electrons. Using the provided starting and product
structures, draw the curved electron-pushing arrows for the following reaction or mechanistic step(s).
Be sure to account for all bond-breaking and bond-making steps.
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H.
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Select to Edit Arrows
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Select to Edit Arrows
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Rotation
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Chapter 27 Solutions
Principles of Instrumental Analysis
Ch. 27 - Prob. 27.1QAPCh. 27 - Prob. 27.2QAPCh. 27 - Prob. 27.3QAPCh. 27 - Prob. 27.4QAPCh. 27 - Prob. 27.5QAPCh. 27 - Prob. 27.6QAPCh. 27 - Prob. 27.7QAPCh. 27 - Prob. 27.8QAPCh. 27 - Prob. 27.9QAPCh. 27 - What are hyphenated GC methods? Briefly describe...
Ch. 27 - Prob. 27.11QAPCh. 27 - Prob. 27.12QAPCh. 27 - Prob. 27.13QAPCh. 27 - Prob. 27.14QAPCh. 27 - Prob. 27.15QAPCh. 27 - Prob. 27.16QAPCh. 27 - Prob. 27.17QAPCh. 27 - Prob. 27.18QAPCh. 27 - Prob. 27.19QAPCh. 27 - The same polar compound is gas chromatographed on...Ch. 27 - Prob. 27.21QAPCh. 27 - Prob. 27.22QAPCh. 27 - Prob. 27.23QAPCh. 27 - Prob. 27.24QAPCh. 27 - Prob. 27.25QAPCh. 27 - Prob. 27.26QAPCh. 27 - Prob. 27.27QAPCh. 27 - Prob. 27.28QAPCh. 27 - Why is GSC not used nearly as extensively as GLC?Ch. 27 - Prob. 27.30QAP
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